Every monsoon season, patients walk in with red, watery, intensely irritated eyes. Eye flu, the common name for viral conjunctivitis, is one of the most contagious eye infections. While it is not dangerous, it is a significant discomfort. Mismanagement, particularly the unsupervised use of steroid eye drops, can also lead to serious complications, including corneal damage.
In this blog, we cover everything you need to know about eye flu: what causes it, how to identify it, how it spreads, how to recover safely, and what to do and what to avoid.
What is Eye Flu (Viral Conjunctivitis)?
Eye flu is an infection of the conjunctiva, the thin transparent membrane that lines the inner surface of the eyelids and covers the white part of your eye (the sclera). When a virus infects the conjunctiva, blood vessels within it become inflamed and dilate, producing the characteristic pink or red discolouration.
The term "eye flu" reflects its behaviour: like the flu, it spreads rapidly through communities, tends to occur in outbreaks during specific seasons, and resolves on its own in most cases without requiring aggressive treatment.
While viral conjunctivitis is the most common form, conjunctivitis can also be caused by bacteria (bacterial conjunctivitis), allergens (allergic conjunctivitis), or chemical irritants. Each has a distinct clinical presentation and requires a different management approach.
What Causes Eye Flu? Common Viruses and Triggers
Viral conjunctivitis is most commonly caused by adenoviruses that are also responsible for the common cold and respiratory tract infections. This explains why eye flu often goes with or follows an upper respiratory infection,and why it tends to peak during the same seasons.
Other viruses that can cause conjunctivitis include:
- Enterovirus 70 and Coxsackievirus A24: responsible for epidemics of acute haemorrhagic conjunctivitis, a more severe form that causes subconjunctival bleeding (visible as a red patch on the white of the eye)
- Herpes Simplex Virus (HSV): causes a less common but more serious form of viral conjunctivitis that requires specific antiviral treatment and ophthalmological evaluation
- Varicella-Zoster Virus:can involve the eye as part of shingles affecting the face (herpes zoster ophthalmicus)
Why Does Monsoon Make It Worse?
Monsoon conditions create near ideal circumstances for eye flu outbreaks. High humidity, waterlogging, flooding of streets, increased crowding in enclosed spaces, and the general decline in hygiene practices that accompanies heavy rains all accelerate viral transmission. Delhi NCR, with its population density, shared commuting infrastructure, and school environments, consistently reports sharp spikes in conjunctivitis cases from July through September each year.
How Eye Flu Spreads: Understanding Transmission?
Eye flu is highly contagious. Contrary to a popular misconception, simply looking at someone with conjunctivitis does not transmit the infection. It spreads through:
- Direct contact: touching an infected person's eye or the discharge from it, then touching your own eye
- Contaminated surfaces: viruses survive on surfaces for hours shared towels, pillowcases, handkerchiefs, mobile phones, keyboards, and door handles are common intermediaries
- Respiratory droplets: adenoviruses, being respiratory viruses, can also spread through coughing and sneezing in close places
- Shared eye items: sharing eye makeup, contact lenses, lens cases, or even sunglasses can directly transfer the infection
An infected person can spread infection to others from the moment symptoms appear until the eye discharge has completely resolved typically 7 to 14 days. This is why careful personal hygiene is necessary to prevent household or classroom outbreaks.
Children can be contagious before parents notice significant redness or discharge. Frequent handwashing, avoiding eye rubbing, and not sharing stationery, towels, or electronic devices can significantly reduce transmission in schools and homes.
Symptoms of Eye Flu: What to Look For?
Eye flu typically begins in one eye and spreads to the other within 24 to 48 hours. Symptoms usually develop 1 to 3 days after exposure and include:
- Redness and pinkness: the most visible sign, caused by dilation of blood vessels in the conjunctiva, hence the name pink eye.
- Watery discharge (lacrimation): the eye produces excess tears as a defence mechanism to wash out the irritants
- Itching and burning: a persistent urge to rub the eye, which worsens the infection and risk of sore
- Gritty or foreign body sensation: the feeling that something is stuck in the eye
- Eyelid swelling: particularly in the morning, when discharge accumulates overnight
- Crusting: dried discharge that seals the eyelid shut after sleep a hallmark of both viral and bacterial conjunctivitis
- Light sensitivity (photophobia): discomfort in bright light, particularly in more severe adenoviral infections may occur if cornea is involved.
- Blurred vision: usually mild and temporary, caused by discharge or formation of spots on the corneal surface
In adenoviral conjunctivitis specifically, patients may also develop swollen preauricular lymph nodes (in front of the ear) and occasionally a sore throat or mild fever reflecting the systemic respiratory nature of the underlying virus.
Treatment and Recovery from Eye Flu
Viral conjunctivitis is a self-limiting condition in most healthy adults and children; it resolves on its own within 7 to 14 days without any specific antiviral treatment. Medical management is largely supportive, focused on relieving symptoms and preventing complications.
Doctor’s Recommended:
- Lubricating (artificial tear) eye drops: reduce dryness, irritation, and the foreign body sensation. Available over the counter and safe for regular use
- Cold compresses: a clean cloth soaked in cold water, applied gently over closed eyelids, reduces swelling and provides symptomatic relief. Make sure not to reuse the same cloth
- Eyelid hygiene: gently cleaning the eyelid margin with a fresh, damp cotton pad wiping from the inner corner outward removes discharge and crust without spreading infection, throwing the wipe away after each use.
- Antibiotic eye drops: may be prescribed if there is a significant discharge from the eye
What Requires a Doctor's Prescription?
Antibiotic eye drops are not effective against viruses and should not be self-prescribed for viral conjunctivitis. Steroid eye drops should never be used without ophthalmological supervision while they can reduce inflammation, unsupervised steroid use in eye infections can worsen viral replication, promote fungal overgrowth, raise intraocular pressure, and in severe cases cause corneal ulceration or even vision loss.
Antiviral eye drops are prescribed only in specific cases such as herpes simplex or herpes zoster conjunctivitis and require a confirmed diagnosis before use.
In some cases of adenoviral conjunctivitis, inflammation can temporarily affect the cornea, causing blurred vision or glare even after the redness has subsided. If vision remains affected after recovery, a follow-up eye examination is recommended.
When to See a Doctor Immediately?
Symptoms worsen significantly after the first 3 to 4 days
- Vision becomes noticeably blurred and does not clear with blinking
- Severe eye pain (not just irritation)
- The eye becomes extremely sensitive to light
- Symptoms persist beyond 14 days without improvement
- A newborn or very young infant develops eye redness and discharge; this requires urgent evaluation
Eye Flu Do's and Don'ts
Following the right practices during an episode of eye flu protects your recovery and prevents spreading the infection to others.
Do's
- Wash your hands thoroughly with soap and water before and after touching your eyes or applying eye drops
- Use a separate, freshly laundered towel and pillowcase every day for the duration of the infection
- Apply cold compresses with a clean cloth to reduce swellig and discomfort
- Use lubricating eye drops (artificial tears) as directed to soothe irritation
- Clean discharge gently with a fresh cotton pad, wiping from the inner to outer corner
- Stay home from school or work until active discharge has stopped, typically 5 to 7 days
- Consult an ophthalmologist if symptoms are severe, persistent, or involve any change in vision
Don'ts
- Do not rub your eyes; it intensifies inflammation and transfers the virus to your hands and surfaces
- Do not share towels, pillows, handkerchiefs, eye makeup, or contact lenses with anyone
- Do not self-prescribe antibiotic or steroid eye drops; this is one of the most common and dangerous mistakes in eye flu management
- Do not wear contact lenses until the infection has fully resolved
- Do not use the same cotton pad twice or wipe from the outer to inner corner
- Do not dismiss persistent symptoms as ordinary eye irritation; delayed diagnosis of herpes-related conjunctivitis can lead to corneal scarring
- Do not bring young children with active conjunctivitis to school or crowded spaces
Expert Eye Care at Artemis Hospitals, Gurugram
Most cases of eye flu resolve with supportive care and sensible hygiene within two weeks. But when symptoms are severe, atypical, persistent, or affecting vision, professional ophthalmological assessment is not just advisable as it is essential. Conditions like herpes simplex keratoconjunctivitis, acute hemorrhagic conjunctivitis, or bacterial superinfection on top of viral conjunctivitis require accurate diagnosis and targeted treatment that only a qualified eye specialist can provide.
At Artemis Hospitals, Gurugram, our Ophthalmology dept offers comprehensive evaluation and management of all forms of conjunctivitis and eye infections, with access to slit lamp examination, advanced diagnostic imaging, and a team of experienced ophthalmologists.
Whether it is a case of monsoon season eye flu that has not improved as expected, a child with recurrent conjunctivitis, or a concern about vision changes during an eye infection the Ophthalmology team at Artemis is equipped to provide accurate diagnosis and safe, evidence-based treatment.
Article by Dr. Vishal Arora
Head - Ophthalmology
Artemis Hospitals
